<ul><li>Testing software through its behavior, not its implementation, is crucial for better design.</li><li>Tests focusing on internal behavior rather than system achievements are brittle and untrustworthy.</li><li>Decomposing responsibilities and depending on interfaces can help create behaviorally focused services.</li><li>Testing externally visible outcomes instead of spying on internal behavior leads to more robust tests and better software design.</li></ul>

Testing by Behavior, Not Implementation: Eliminating Spies Through Better Design

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